package com.wenhao.unsafe;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.ConcurrentHashMap;

/**
 * @author Wenhao Tong
 * @create 2021-08-19 21:55
 */
public class MapTest {
    public static void main(String[] args) {

        Map<String,String> map = new ConcurrentHashMap<>();

        for (int i = 0;i < 30;i++) {
            new Thread(() -> {
                map.put(Thread.currentThread().getName(),UUID.randomUUID().toString().substring(0,5));
                System.out.println(map);
            },String.valueOf(i)).start();
        }
    }
}
